Electbic igniting mechanism fob intebnal-combtjstion engines



April 6 1926. v

A. A. KENT ELECTRIC IGNITING MECHANISM FOR INTERNAL COMBUSTION ENGINES Original Filed Ap 9, 1917 2 Sheets-Sheet 1 April 6,1926. R 16,313

' A. A KENT ELECTRIC IGNITING MECHANISM FOR INTERNAL COMBUSTION ENGINES Original Filed April 9, 1917 2-Sheets-Sheet 2 Reissued Apr. 6, 1926.

FICE.

ARTHUR ATWATEB KENT, OE ARDMORE, PENNSYLVANIA.

ELECTRIC IGNITING MECHANISM FOR INTERNAL-COMBUSTION ENGINES.

Original No. 1,341,136, dated May 25, 1920, Serial No. 160,651, filed April 9, 1917. Application for reissue filed July 27, 1921. Serial 1T0. 488,007.

To all whom it may concern:

Be it known that I, ARTHUR ATWATER KENT, a citizen of the United States, and a resident of Ardmore, Montgomery County, State of Pennsylvania, have invented certain new and useful Improvements in Electric Igniting Mechanisms for Internal-Conlbustion Engines, of whichthe following is a specification.

My invention relates to apparatus ,for controlling the production of electric sparks for igniting combustible charges in the cylinders of internal combustion engines.

An object of the present invention is to rovide a mechanism which will automatally vary the time at which the sparkis produced substantially proportionally to -variations in thespee'd of the engine.

My improved device consists of a combined contact maker, distributer and speed responsive or spark controlling device, all arranged within a casing in a simple and compact manner, the speed responsive device being operable to advance the cam, which operates the contact device, and at the same time\ to also advance the arm of the distributer by means of whichthe various cylinders are consecutively put into series -with the secondary winding of the induction coil, the primary winding of which is closed and opened very rapidly by the'contact device.

In my prior Patent No. 1,192,788, dated July 25, 1916, is illustrated one form of an automatic device for performing generally the functions above indicated, and my present invention relates to certain improvements therein whereby the device is sim plified, the construction is rendered very much more com act, and the work of assembling is simp died with a consequent reduction in the cost of manufacture.

Another object of my invention is to so construct the speed responsive device that the weights of the parts acted upon by centrifugal force may be materially reduced and theaction thereof may be made more sensitive. Another object of my invention is to make the'cam, which-operates the contact device,-substantially a part of the speed responsive device rather than one which is operated by a speed res onsive device through the intermediary 0 some connectron.

Another object of my invention is to make Re.16,313' UNITED STATES PATENT 0F the whole mechanism much more nearly balanced to thereby avoid vibration in the mechanism when the parts are being driven at a rapid speed. A further object of my invention is to dispense with any bearing of the contact maker cam in the base upon which the contact maker is supported, said cam being mounted and supported on the driving shaft.

A further object of my invention is to provide a construction in which the main shaft is mounted in a single bearing extending to a point very near the contact device cam,fland in which the main shaft itself substantially supports the speed responsive dethe same with the cap in which the distributer contact ,points are mounted, removed to expose the contact maker; Fig. 3 is a plan view of the mechanism with the distributer arm and the base of the contact maker, together with the parts attached thereto, removed and disclosing'a plan view 'of the speed responsive device or controlling mechanism'pFig. 4 is a plan view of the bottom part of the casing with the controlling mechanism and driving shaft re moved.

Fig. 5 is a vertical sectional view on the line 5.5- of Fig. l, the speed responsive mechanism or governing mechanism being not sectioned but shown in side elevation; Fig. 6 is an inverted or bottom view of the controlling mechanism showing the positions of'the weights and driving shaft is stationary; Fig. 7 is a vertical sectional view through the lower portion of the casing and through the governing mechanism, same being taken .onthe line 7-7 of Fig. 3, thetop of the main sectional view of the governor or speed responsive mechanism taken on the" line 8:8

of Fig. 6.

springs when the 70 vice, the cam for the contact maker, and the preferably mounted upon a metallic base or 'plate.'(, secured b screws 8'-88 to the top of the-cup-shape portion 2, and the cap 4 is r preferably seated on the top of the base plate 7 and positioned with respect thereto by lugs 9.-9 molded on the bottom edge of the cap 4 and adapted to register with the corresponding openings 10-10 in the base plate 7. For holding the cap 4 fixedly to but readily removable from the base late 7, and

the cup-shaped port ion 2, I pre erably rvide a pair of spring clips 11-1l pivote on suitable pivot pins 1212 on opposite sides of the cup shaped portion 2 of the casihg, the

upper ends of said spring clips 11 being bentto form spring hooks adapted to snap into recesses 13-13 provided therefor on opposite sides of the cap or cover 4. The cap ,4 is preferably provided with a convex top surface from which extend four hollow projections 14 equi-distant from the center or axis of the cap 4 and equi-distant from each other, each-being ada ted to fit over and hold respectively one o the leads of the secondary circuit extending each respectively to a cylinder of an internal combustion en; gine. These leads passing through the proection 14 are ,respective y connected with a theterminal and .contact points or plates 15 embedded in the capf4'and arranged to cooperate with' the distributor arm 16 of the 1 V distributing mechanism 5. At the center of the cap 4, and projecting vertically there- :from, is a fifth hollowprojection 17 adapted to fit over the lead which extends to the secondary winding of the induction coil, and

, which afl'ords communication with the central terminal and contact point or plate 18 of the distributor mechanism also embedded in the cap 4 as clearly appears in Fig. 5.

'The cup-shaped portion 2 of the casing 1 is preferably provided with. a centrally arranged outwardly projecting hub 19, by

means of which the whole devicemay be suitably mounted and supported for rotation by actuation of lug 2' for manual advance or retardation of the ignition. In hub 19 is suitably journaled the driving shaft .20 provided at its lower end with a clutch or coupling 21, by means of which it may be attached to a shaft of an internal combustion engine.

Within the cup-shaped portion 2 of the hub or projection 19 provi es the journal for the shaft 20, and extends to-substantially the top of the main portion of the driving shaft 20. Near the top of the main portion of the driving shaft 20 a plate 23 is rigidly united with the shaft 20, the plate 23 being preferably substautiall square. This of the speed responsive mechanism 3. This plate 23 rests on the top of the lug or projection 22, the upper end of the lug 22 forming the thrust or step bearing upon plate 23 forms the support or and is a part which the shaft 20 of the speed responsive mechanism 3 is supported. I

Depending from the plate 23 is a pivotal stud 24 forming a pivot pin to which one end of a substantially L-shaped weight 25 is attached. The said weight 25 is, however, spaced from the plate 23, by a collar or washer26;

On the diametrically opposite side of the plate 23 (with respect to the axis of the shaft 20) is a similar depending stud 27 forming a pivotal support for a similar substantially L-shaped weight 28, saidlweight being similarly spaced from the plate 23 by a similar collar or washer 29. These weights 25 and 28 are exactly alike but the laterally extending portions 25' and 28 thereof ex tend in opposite directions on opposite sides of the axis of the shaft 20, and said portions 25' and 28' are slightly curved to approximate substantially the arc ofa circle whose center is the axis of the shaft 20.

Above the plate 23 the shaft 20 is substantially reduced in diameter to form an extension 30 integral with said shaft 20 and forming a support-or bearing for' tlfe conbined-contact maker or cam 31, distributor arm support 32 and upper plate 33 of the speed responsive device 3. The contact maker cam 31 and distributor arm support 32 are preferably made of suitable molded insulating material, such as .bakelite, and is.

itself, as plainly shown in Figs. 7 and 8,

said hub or annular projection 34 having an aperture 35 through the hub thus formed and projecting above the top surfaceof the with.

plate33. The plate 33 is so provided with a larger circular recess 36 concentric with the aperture 35 below the smooth or bottom side thereof. The combined bakelite cam 31 and distribilter arm 32 are molded into, over and around the,hole 35, recess 36 and projection or hub 34 which form a consid-.

erable surface on the plate 33 and in this way the same are rigidly united andanchored to the plate 33, as clearly shown in Fig. 7. This molded cam 31'and distributer support 32 has also molded in it at the same time an axial hole or opening 37 to smoothly fit over the reduced extension 30 of the shaft 20. The hole'37 is preferably deeper than the length of the said reduced extension 30, so that when the unitary contact maker cam 31 distributer arm support 32 and upper plate 33 of the governor mechanism are slipped over the reduced extension 30 the plate 33 bears against the shoulder between the. main portion of the shaft 20 and the reduced extension 30 and is thus supported the shaft 20 in axial alinement there- The' upper plate 33 is provided with a depending stud 38 passing through an arcshaped slot 39 in the bottom plate 23, the center of said arc-shaped slot being the axis of the shaft 20 and this stud 38 forms a pivot for a substantially L-shaped weight 40.

like the weights 25 and 28, having-a laterally extending portion 40' overlying or overlapping the corresponding portion 25 of the weight 25. The weights 25 and 40 are pivoted together on a stud 41 riveted to the weight 25 and extending freely through the weight 40 and through an arc-shaped slot 42 in the bottom plate 23, the center of said arc-shaped slot 42 being the axis of the stud 24. This stud 41 is provided with a head 43 on the upper surface of the bottom plate 23 the diameter of said head being greater than the width of said slot 42.

On the diametrically opposite side of the top plate 33 and at the same distance from the axis of the shaft 20 that the axis of the stud 38 is, is riveted a depending stud 44 passing through the plate 33 through an arc-shaped slot 45, the center of curvature of which is the' axis of the shaft 20, and passing below the bottom plate 23, forms for a fourth substantially L-shaped weight 46 like the weights above described, but whose laterally extending portion 46' overlies or overlaps the laterally extending portion 28' of the weight 28. The weights 40 and 46 are between the weights 25 and 28, respectively, and the bottom plate 23. The overlapp ng portions 46' and 28 of the weights 46 and 28 are pivoted together by a stud 47, riveted to the weight 28, which stud 47 passes freely through a circular opening in the weight 46 and thence through an areshaped slot 43 in the bottom plate 23. The

weight 40 and the .and rendering them sensitive.

a pivot center of said arc-shaped slot 48 is the axis of the stud 27 and this stud 47 is provided with a head 49 on the top of the bottom plate 23 of -larger diameter than the width of the slot 48.

coil spring 54, the other end of which is attached to a stud 55 depending from the side of the plate 23 and diametrically opposite the said stud 52. In their normal positions, that is to say, when the shaft 20 is stationary, these coiled springs 51 and 54 are in axial alinement with each other and their longitudinal axes pass through the axis of the shaft 20. v

The four weights above described are all loosely mounted at all their respective points of pivotal connection to the plates 23 and 33 and to each other, as above described, and the studs pass freely through their respective arc-shaped slots in the plate 23; be-

tweenthe weights 25 and 40 and between the plate 23 are thin spacing washers 56, and similarly between the weights 28 and 46 and between the weight 46 and the plate 23 are like thin spacing washers 56 so that these weights do not bear against each other nor against the plate 23.

A similar thin washer 56 is placed on the stud 38 between the weight 40'and the bottom plate 23; and also one on the stud 44 between the weight 46 and the bottom plate 23. These washers thus greatly diminish friction, keep the weights out of substantial rubbing or sliding engagement with the plate 23 and eaclrother, reducing t liability of their sticking, reducing friction.

The relatively loose pivoting of the weights to their studs and to each other also contributes to the same end.

It will be observed that the saidweights are all on the under side of the bottom plate 23 surrounding the lug or projection 22, that is to say, that the bearing for the shaft '20 extends within the weights and up to and against the bottom plate 23 of the speed responsive device. This disposition of the parts supports the weights below the top of the shaft 20 and below the top of the bearing for the shaft 20, thus reducing very materially the distance which said bearing extends below the bottom of the cup-shaped portion 2; reducing the height of the cup-, shaped portion 2 of the casing; and firmly Supporting the shaft in a bearing extending to a point adjacent the operative portion u oi the contact maker cam 31. This construcported the contact tion also makes it posible to support the eontact maker cam and distributer arm supable thereon, to an up-turned end of which is secured aleaf spring 58, on the other end of which is attached a movable contact carrying arm 59, the free end of which is provided with a cam-engagingvtip 60, preferably of hard smooth steel or similar mate-, rial. On this arm 59 is carried a platinuin' or tungsten movable interrupter or timer contact 61 adapted to cooperate with a stationary interrupter or timer contact 62 mounted on a bracket 63 longitudinally adjustable on a condenser plate or cover 64 which is insulated in any suitable manner from the base plate-7. Normally the conjustable on sai tacts 61 and 62 are in engagement but as the contact maker cam 61 is revolved the high parts of the said cam intermittently lift the movable contact 61 out of engagement with the stationary contact 62. During the period when the low parts of the cam 31 are passing under the tip of the arm 59 the spring 58 returns the movable contact into engagement with the stationary contact to close a circuit of the ignition system.

Between the base 7 and the cover 64 is clamped in any suitable manner a condenser 65 bridging the contacts 62 and 63.

'Above the cam 31 extends the distributer arm support 32 into the upper end of which, is embedded ametal bushing 66 which is threaded to receive a set screw 67; the upper end of the distributer arm support is also referably provided with molded'lugs 68 a apted to pass through a slot 63 in the metal distributing arm or block 16, said set screw 67 servin to rigidly hold said distributer arm or look on to the top of the distributer support, and said arm because of slot 69 bein slightly longitudinally adg support to permit the end 16' to be brought into suitable electrical cooperation with the terminals or plates 15. The other end 16" of the distributer projects on the o posite side thereof sufliciently to; substantial y counterbalance the end 16. To the to of the distributer arm 16 is riveted a lea spring 70 adapted to engage with the central contact point or plate 18 of the distributer.

The centrifugal force, developed in the weights 25, 28, 4O and46 by the rotation of the shaft 20, acts to throw the weights outwardly radially from the axis of the shaft to a position where this force is balanced by the springs 51 and 54. The springs 51 and 54 being normally in the position shown in Fig. 6, the first movement of the pivot-pins or studs 38 and 44 is substantially at right angles to the axis of said springs, as indicated by the arrows 71, Fig. .6, and such first movement is only slightly resisted by the springs. A considerable movement of said pins rom this position operates to turn said springs about their studs 52 and 55 without stretching the springs to a great extent. As the studs 38 and 44 continue to move about the axis of the shaft 20 and in their slots 39 and 45, under'an increased centrifugal force due to increased, speed of the shaft 20, the direction of their motion more nearly approaches one axially of the springs, that is to say, they stretch the springs more and turn them less about their pivot pins or studs'52 and 55. The resistance of the springs to the motion of the studs 38 and 44 therefore rapidly increases as the novement or displacement increases, and this resistance I have found to be substantially proportional to variations in the centrifugal force developed in the weights at such varying speeds. As a result of this the amount of angular movement of the top plate 33 with respect to the bottom plate 23 is substantially directly proportional to variations in speed of the shaft 20.

The ends of the springs 51 and 54 which are respectively seated in the kerfs 50 and 53, serve to retain the'weights' lttgand 46191 their pivotal'studs'38 and 441withouts;other securing means.

These. springs resist F .advance of the plate 33 b mh fl,

force developed by the rotation of -the;

weights about the shaft 20 and also serve to prevent the said weights 40 and 46 from slipgping off their pivot pins respectively.

y making the cam 31, distributer arm support 32 with the positioning lugs 68 and slate 33 unitary there can be no angular is lacement of these pal'ts with respect to great numbers exactly alike, and all assemblin and adjusting of said three parts is abso utely eliminated. Moreover, if for any reason that part requires to be replaced in an old machine, it is only necessary to remove the cap 4, remove the plate 7 .and

other, and these units-may be made in draw the entire speed responsive mechanism as a unit, with the. shaft 20, from the cap 2. The ends of the springs 51 and 54 may be then released from the kerfs 50 and 53 and the combined cam, distributer support and top plate with the studs 38 and 44 ma be drawn out of the other parts and of! o the extension 30, and anew one as readily 'ut back in place, without in any manner disturbing the adjustment of the timer or distributer, or disturbing the adjustment of the speed responsive mechanism thereto.

The cam structure extends from shaft 20 upwardly through the aperture 7 in member. 7 without hearing or support on member 7 It will be seen that each weight or governing member is looselyheld or supported and at two points only, namely, at the pivotal point at one end of each governing member and at the pivotal point where two cooperating members are pivoted together. To prevent these members from tipplng on these pivotal points the holes for the PIV- otal 1118 through each member are so disposed that the weight of each member on one'sideof a line drawn through these pivotal points is balanced. As indicated in Fig. 6 the weight of the member on one side of the dot and dash line 72-72 balances the weight of that part of the other side of said line. p

The weight of each governing member is thus balanced on each side of the line passing through the two points at which each weight is pivoted. This feature of construction makes it possible to loosely pivot the members 22, 25, 40 and 46 together as above described and at the same time avoids any tendency of the members to turn about the lines, connecting their pivotal points, as axes. It also prevents any binding or cramping of the members on their pivots and reduces'the frictionbetween the members. or between the members'and the plate. as they move or slide over eachother and over the plate 23. This construction renders the governing members very sensitive and responsive to variations in the speed of the drive shaft.

It is, of course, to be understood that the number of cam faces and of leads of the sec ondary circuit will vary with different en gines to correspond with the number of cylinders.

\Vhat I claim is:

1. .In a spark forming and controlling device the combination of a casing, a driving shaft, a journal for said drive shaft in said casing and extending upwardly into said casing and forming a step or thrust hearing, a plate rigidly secured to said shaft and resting on said step bearing. a second plate, a combined cam and distributer arm support rigidly secured to said second plate and mounted and supported on the top end of said shaft and rotatable with respect to said shaft and means operativcly attached to said plates and located below said first mentioned plate to vary the angular position of said top plate and the arts carried thereby with respect to said drive shaft;

2. In a spark forming and'controlling de vice the combination of: a cup-shaped casing, a driving shaft, a journal for said drive shaft in said casing, and extending upwardly in said casing and forming a step or thrust bearing, a plate rigidly secured to said shaft and supported on said thrust bearing, a second plate loosely journaled on said shaft above said first mentioned plate, means operatively attached to said plates and located below said first mentioned plate and surrounding said journal to vary the angular position of said top plate with respect to said shaft proportionally to variations in the'speed of said drive shaft, and to drive said second mentioned plate from said drive shaft, and a contact maker cam and distributor 'arm support of insulating material unitarily united to and supported by said second mentioned plate.

3. In a spark forming and controlling device the combination of a cup-shaped casing, a driving shaft, a journal for said drive shaft in said casing, and extending upwardly in said casing and forming a step or thrust bearing, a plate rigidly secured to. said shaft and supported on said thrust bearing, a second plate loosely journaled on said shaft above said first mentioned plate, means operatively attached to said plates and located belowesaid first mentioned plate and surrounding said journal to vary the angular position of said top plate with respect to said shaft proportionally to variations inthe speed of said drive shaft, and to drive said second mentioned plate from said drive shaft, and a combined contact maker cam and distributer arm support of bakelite mounted on said second mentioned plate and supported thereby and unitarily molded thereto.

4. In a spark forming and controlling device the combination of a drive shaft comprising a main portion and a reduced upper end, a plate, a combined cam and distributer arm support of insulating material united by molding to said plate and provided with an axial bore fitting over the reduced end of said shaft, a plate secured to said drive shaft adjacent the shoulder between the main portion and the reduced portion of said shaft. a weight pivoted at one end to said first mentioned plate, a. weight pivoted at one end to saidsecond mentioned plate, means to pivot the free ends of said weights together, said weights being below said plate on said main portion of said shaft, a journal for said drive shaft extending to saidplate on said drive shaft and forming a stop or thrust bearing for said plate on said main portion whereb 'v said plates. weights and parts carried thereby are all mounted on said shaft. and

supported on saidthrust bearing.

1 5. In ,a' spark forming and controlling device the; combination with .a drive shaft comprising a nmin-portion and a upper end, providin them, a plate, a com ined cam and distributer arm support of insulating material umtarily united by molding to said plate and provided with an axial bore fitting over the reduced end of said shaft and supported on said shoulder, a plate secured to said drive shaft adjacent said shoulder, and a air of L-shaped weights having their ends oosely pivoted, respectively, to said plates and located below said plate on said drive shaft, and having their free ends overlapping and loosely pivoted together anda ournal for said drive shaft extending to said plate on said drive shaft, and forming a thrust bearing therefor.

6. In a spark forming and controlling device the combination of a drive shaft, a top plate, a bottom plate, a weight below said bottom plate pivoted at one end to said top plate on a pivot extending through sai with respect to each other and yieldin rigidly secured, a journal .for sai said bottom plate, a. weightbelow said bottom plate pivoted at one end to said bottom plate, pivotal means connecting the free endsof said weights, a complemental pair of similar weights similarly pivoted, respectively, to the top and bottom plates and to each other and symmetrically disposed with respect to said first mentioned pair of wei hts, and yieldingmeans tending to hold (I plates in a fixed and angular relation under the action of centrifugal force in sai weights to counterbalance said centrifugal force and to regulate the amount of angular movement of said top plate, with respect to said bottom plate.

7. In a spark forming and controlling device the combination of a to plate, a bottom plate, a air of su stantially L-shaped weights pivoted at one end to said top plate and said bottom plate, re-

spectively, and having their free ends pivoted together, said weights being disposed below said bottom plate, and being disposed on one side of a line passing through the axis of said shaft, a similar pair of similar weights similarly pivoted, respectively, to said top and bottom plates and to each other and symmetrically disposed below said bot tom plate on the opposite side of said line, a drive shaft to which said bottom late is drive shaft forming a thrust bearing upon which said bottom plate is supported and rotated, and a contact maker cam mounted upon said top plate in axial alinement with said shaft. 7

8. In a spark forming and controlling device the combination of-a top plate. a bottom plate, a pair of substantiallv L-shaped weights pivoted at one end to said top plate and said bottom plate, respectively, and having their free ends "pivoted together, said weights being disposed below said bottom plate, and being disposed on one 5 49 'of a a shoulder betweem line passing through the axis of said shaft,

a similar pair of similar weights similarly pivoted respectively, to said top and bottom plates and to each other and symmetrically disposed below said bottom plate on the opposite side of said line, a drive shaft to which said bottom plate is rigidly secured, a

journal for said drive shaft forming a thrust bearing upon which said bottom plate is supported and rotates, and a combined contact maker cam and distributer arm support of insulating material unitarily united to said top plate and supported by said shaft. I

9. In a-spark forming and controllin device the combination of a dliV8 Sl1flft%\8-V- ing a reduced upper end forming a shoulder, a combined cam and distributer arm support journalled on said reduced end, a top plate rigidly secured to said combined cam and distributor arm support and-bearing against said shoulder, a bottom plate rigid 1y secured to said shaft adjacent said shoulder, a weight below said bottom plate pivoted at one end to said bottom plate, a second weight below said bottom plate and pivoted at one end to said top plate on a pivot extending freelythrough said bottom plate, pivotal means connecting the free ends of said weights together, a journal for said shaft having an upper and forming a thrust or step bearing upon which said bottom plate bears and a spring tending to hold said plates in a fixed relation with respect to each other and yieldingly resisting the pull of centrifugal force developed in said weights.

1 0.In a spark forming and controlling device the combination of a. drive shaft, a plate having a center hole .or opening and an annular flange extending on one side of said plate co-axiall with said opening, said plate being provi ed with a recess in its opposite side larger than and co-axially with said flange, a combined cam and av distributer arm support of insulating material molded on, over and around said flange and .into said hole and recess, and provided with an axial bore into which said upper end of said shaft smoothly fits, a spark advancing and retarding mechanism operatively connecting said driving shaft and said plate, a contact device operated by said cam, a. distributer arm secured to the top of said support and a series of contact plates cooperating with said distributer arm.

11. In a spark forming and controlling device the combination of a drive shaft, a plate having a central hole or opening and an annular flange extending on one side of said plate co-axially with said opening and provided with a recess on the other side thereof larger than and coaxially with said opening through said flange and a combined d tri uter' pp r f law lating material molded on, over and around sald flange and into sald hole and recessand provided with an axial bore into which the upper end of said shaft smoothly fits, a

. arm which cooperates with said contact points.

12.'In a spark forming and controlling device the combination of a hollow cup-like casing, the base plate of a contact maker secured to the top of said casing, a driving shaft provided with an extension passing through said base plate, a. contact maker operating cam journaled on said extension, a contact maker operated thereby and mounted on said base plate and a cam advancing and retarding mechanism operated by centrifugal force and operatively connecting said cam and drive shaft, said mechanism comprising a plate operatively connected to said cam, a plate rigidly secured to said drive shaft, a weight pivoted at one end on said first mentioned plate on a pivot passing through said plate on said drive shaft, a weight pivoted to said second mentioned plate and having its free end pivoted to the free end of said first mentioned weight, said weights being below said plates and within said cup-shaped casing, a spring tending to hold said plates in a predetermined position and operating to counterbalance the centrifugal force developed in said weights, and the distributer arm rigidly secured to said shaft and rotated therewith and transversely adjustable thereon.

13. In a spark forming and controlling device the combination of a drive shaft, a governing mechanism driven by said drive shaft, and including a plate driven by said shaft through said governing mechanism and angularly advanced and retarded by said governing mechanism, said platebeing provided with an annular flange projecting from one side thereof and with an annular recess co-axial with the opening through an axis in substantial alinement with the axis of said shaft and a pair of substantially L-shaped weights or governing members on the same side of both of said plates, each member having one of its ends loosely pivoted to one of said plates respectively, said members having their free ends respectively overlapping and disposed in parallel planes, and a pivotal connection loosely pivoting same together intermediate of their ends, the weight of each member being balanced on each side of a line drawn through the pivotal points thereof.

. 15. The combination with ignition timing cam, of a governor member secured thereto,

a driving shaft, a second governor member secured thereto at the end thereof, weights movable under the influence of centrifugal force for angularly adjusting said governor members with respect to each other, said first named governor member disposed adjacent the end of said shaft on one side of said second governor member, and all the governor weights disposed on the opposite side of said second governor member.

16. The, combination with ignition timing cam, of a governor member secured thereto,

a driving shaft, a second governor member secured thereto, weights movable under the influence of centrifugal force for angularly adjusting said governor members with respect to each other, all of the governor weights disposed on one side of that governor member which is secured to said shaft, and the other governor member disposed on the opposite side of said governor member which is secured to said shaft.

, 17. The combination with ignition timing structure, as a cam, of agovernor member secured thereto, av driving shaft, a second governor member secured thereto, and a pair of governor weights pivoted, respectively, to said governor members and both disposed on one side of one of said governor members, the other governor member disposed on the opposite side of said one of said governor members, said one of said governor members having a slot through which extends the pivot on which one of said weights is pivoted to said other governor member.

18. The combination with ignition timing structure, as a cam, of a governor member secured thereto, a driving shaft, a second governor member secured thereto, a pair of governor weights pivoted, respectively, to said governor members and both disposed on one side of one of said governor members, the other governor member disposed on the opposite side of said one of said governor members, said one of said governor members having a slot through which extends the pivot on which one of said weights is pivoted to said other governor member, and a pivot on which said weights are pivoted to each other, said one of said governor mew bers having a slot in which said last named pivot is movable.

19. The combination with ignition timing structure, as a cam, of a governor member secured thereto, a drivin shaft, a second governor member secur thereto, a pair of weights pivoted to each other upon a pivot movable in a slot in one of said governor members, said weights disposed upon one side of said one of said governor members, and the other governor member disposed on the opposite side of said one'of said governor members.

20. Ignition controlling apparatus comprising a casing, a cover member closing said casing and secured thereon at the end thereof, said cover member having an aper ture, a driving shaft extending into said casing and terminating short of said cover member, a cam member having a bearing on said shaft only and driven by said shaft and extending freely. through said aperture, and ignitioncontrolling contacts disposed upon the outer side of said cover member and controlled by said cam member.

21. Ignition controlling apparatus comprising a casing, a cover member closing said casing, said cover member having an aperture, a driving shaft extending into said casing and terminating short of sa1d cover member, a cam member surmountmg and rotatable with respect to said shaft and having a bearing on said shaft only and extending freely through said aperture, a governor n said casing connecting said shaft with said cam member, and ignition'"controlhng contacts disposed upon the outerside of said cover member and controlled by said cam member.

22. Ignition controlling apparatus com prising a driving shaft, ignition controlling contacts, a cam member for controlling sa1d contacts, an axial extension on sa1d shaft, said cam member having an axial bore receiving said extension, a governor plate on said cam member adjacent the end'of sa1d shaft, a second governor plate secured to said shaft adjacent the end thereof, and weights for angularly adjusting sa1d governor plates with respect to each other. 23.-Ignition controlling apparatus comrising a driving shaft, a hub forming a caring therefor, 'a governor plate secured to .the end of said shaftand disposed at the end of said hub, an extension on said shaft beyond said plate and hub, a cam member havin a bore receiving said extension, a secon governor plate secured to said cam member, weights for angularly adjusting said governor lates with respect to each other, and ignition controlling contacts controlled by said cam member.-

24. Ignition controlling apparatus com rising a driving shaft, a hub formin a hearing therefor, a governor plate secur to the end of said shaft and disposed at the upon one side of said first governor member and surrounding said hub.

25. Ignition controlling apparatus comprising a casing, a hub ternnnating within said casing, a driving shaft having a bearing,

in said hub and terminating in said casing.

beyond the end of said hub, a governor plate secured to said shaft immediately adjacent said end of said hub, 21 cover for said casing having an'aperture, a. cam member extending freely through said aperture, a second governor plate-secured to said cam member, weights for. effecting angular adjustment of said governor plates with respect to each other, and ignition controllin contacts controlled by said cam and disposed upon said cover member.

26. Ignition controlling apparatus comprising a casin a hub terminating within said casing, a riving shaft having a bearing in said hub and terminating in said casin beyond the end of said hub, a governor plate secured to said shaft immediately adjacent said end of said hub, a cover for said casing having an aperture, a cam mem-' ber extending freely through said aperture,

a second governor plate secured to saidjcam member, weights for efl'ectin angular adjustment of said governor plates with respect to each other, ignition controlling contacts controlled by said cam'and disposed upon said cover member, a cap having distributor terminals covering said cover member, and a distributor member of insulating material. on said cam member disposed within said cap co-acting with said terminals.

27. Ignition controlling. apparatus comprising a base memberhaving an aperture, a. driving shaft terminating short ofsaid base in alignment with saidaperture, ignition controlling contacts on the side of said base opposite said shaft, and .cam structure for controlling said contacts havingsa'bearing on said shaft only and extending freely through said aperture and'abutting against the end of said shaft.

28. Ignition controlling apparatus comprising a base member having an aperture, a' driving shaft terminating short of said base in alignment with said aperture, ignition controlling contacts on the side of said base opposite said shaft, an extension on said shaft, and cam structure having a hearing on said shaft only and extending freely through said aperture for controlling said contacts and having a bore receiving said extension.

29. Ignition controlling apparatus comprising a base member having an aperture,

, on said shaft only and extendin a drivin shaft terminatin short of said base in ai ment with sai aperture, ignition contro ling contacts on the side of said base opposite said shaft, an extension on said shaft, and cam structure having a bearing freely through said aperture for controlling said contacts and having a bore receiving said to form a substantially balanced structure 31; In ignition controlling apparatus, a cam and distributor support integral with each other and consisting of molded insulating material, said supportbeing substantially symmetrical about the axis .of rotation, and a conducting distributor arm secured to said support and extending to opposite sides of the axis of rotation beyond said su port and forming a substantially balanced structure.

32 In ignition controlling apparatus, a

unit" consisting of a governor member, a

cam and distributor support, said cam and distributor support integral with each other and consisting of molded insulating material molded to said governor member.

33. In ignition controlling apparatus, a governor member, a cam member and distributor support of insulating material integral with each'other and attached to said governor member, and a metallic distributorsecured to the end of said support.

34. In ignition controlling apparatus, a cam member and distributor support of insulating material integral with each other, said support having lug structure at itskend, a metallic distributor having a slot receiving said lug structure, and means securing said distributor to said support. I

35. Ignition controlling. apparatus comprising a driving shaft, a cam'member, governor plates immediatel adjacent each other side by side longitudina 1y of said shaft and secured tosaid shaft and cam member, respectively, one of said governor plates having an opening, a member on the other governor plate extending into said opening, and

a spring connected at its opposite ends to said governor plates.

.36. Ignition controlling apparatus comprising a driving shaft, a cam member, governor members secured to said shaft and cam member, respectively, one of said governor members having an opening, a pin on ,7

the other governor member extending into said opening, and-a weight pivoted on said 37. Ignition controlling apparatus come. PI'lSlIlg a dr1v1ng shaft, a cam member governor, members lying immediately adjacent each other and secured, respectively, to said shaft and cam member, one of said members' having an opening, a pin carried by the.

other of said members extending into said opening, a second pin carried by one of said members, a spring'normally extending approximately radially from the axis of said shaft and connected at its opposite ends to saidpins, and weight structure for moving said governor members with respect to each other.

' 38. Ignition controlling apparatus comprising a driving shaft, a cam member, governor members comprising plates secured, respectively, to said shaft and cam member and disposed immediately adjacent each other as regards their position longitudinally of the axis of said shaft, weight structure having plate form parallel to said governor plates for movin said governor plates with respect to each of er, and a spring connected at its opposite ends to'said governor plates.

39. Ignition controlling apparatus 'comprising a driving shaft, a cam member, governor members comprising plates secured,

respectively, to said shaft and cam member and disposed immediately adjacent each other as regards their position longitudinally of the axis of said shaft, weight structure having plate form parallel to said governor plates for moving said governor plates with respect to each other, and a spring normally extending substantially radially to the axis of said shaft connected at its opposite ends to said governor plates. 4

In testimony whereof I have hereunto affixed my signature this 22nd day of July,- 1921.

ARTHUR ATWATER KENT. 

